王裕德 | 氣體感測資料上傳

#include "ESP8266WiFi.h" //匯入無線網路程式庫
#include "SSD1306.h" //匯入OLED程式庫

#include "Multichannel_Gas_GMXXX.h"

#include "Wire.h"

SSD1306 display(0x3C, D2, D1); //宣告使用OLED螢幕物件(位址,SDA,SCL）==SDA>D2,SCL>D1

GAS_GMXXX< TwoWire > gas;

int NO2_value, C2H5CH_value, VOC_value, CO_value; //定義要儲存氣體感測器數值的變數
long previousTime = 0; //用來保存前一次狀態的時間
long interval = 2000; //讀取間隔時間，單位為毫秒(miliseconds)

const char *API_KEY = "3HP49CL176OSQ9AC"; //ThingSpeak取得的apiKey，請更換為各組之apikey
const char *HOST = "api.thingspeak.com"; //定義連線至thingspeak網站
const char* MY_SSID = "TCGS-IOT"; //無線基地台SSID名稱
const char* MY_PWD = "22205108"; //無線基地台密碼

void setup()
{
display.init(); //螢幕初始化
display.flipScreenVertically(); //螢幕垂直翻轉
display.setFont(ArialMT_Plain_16); //16字體
display.setTextAlignment(TEXT_ALIGN_LEFT); //置左對齊
gas.begin(Wire, 0x08); // use the hardware I2C
connectWifi(); //呼叫網路連線函數
}

void loop()
{
unsigned long currentTime = millis(); //將當前的時間存入變數currentTime
if(currentTime - previousTime > interval) { //如果當前時間扣除前一次保留時間超過間隔時間(interval)就進入執行程式

// GM102B NO2 sensor

NO2_value = gas.getGM102B();

if (NO2_value > 999) NO2_value = 999;

// GM302B C2H5CH sensor

C2H5CH_value = gas.getGM302B();

if (C2H5CH_value > 999) C2H5CH_value = 999;

// GM502B VOC sensor

VOC_value = gas.getGM502B();

if (VOC_value > 999) VOC_value = 999;

// GM702B CO sensor

CO_value = gas.getGM702B();

if (CO_value > 999) CO_value = 999;

previousTime = currentTime; //離開if時更新時間
send_Data(); //呼叫上傳資料函數
}
display.clear(); //清除螢幕
display.drawString(0, 0, "NO2:"+String(NO2_value)+"ppm"); //x=0,y=0位置顯示二氧化氮（NO2）的值
display.drawString(0, 16, "C2H5CH:"+String(C2H5CH_value)+"ppm"); //x=0,y=16位置顯示乙醇（C2H5CH）的值
display.drawString(0, 32, "VOC:"+String(VOC_value)+"ppm"); //x=0,y=32位置顯示揮發性有機化合物（VOC）的值
display.drawString(0, 48, "CO:"+String(CO_value)+"ppm"); //x=0,y=48位置顯示一氧化碳（CO）的值
display.display();//螢幕顯示畫面
}

//網路連線函數
void connectWifi()
{
Serial.print("Connecting to "+*MY_SSID);
WiFi.begin(MY_SSID, MY_PWD); //連線至MY_SSID無線基地台，MY_PWD為連線密碼
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
display.clear(); //清除螢幕
display.drawString(0, 0, "connect Wifi..."); //將connect Wifi...字串放入暫存區
display.display(); //螢幕顯示畫面
}
}

//傳送資料至ThingSpeak網站
void send_Data()
{
WiFiClient client; // 設定 ESP8266 作為 Client 端

if ( !client.connect( HOST, 80 ) ) {
Serial.println("connection failed");
return;
} else {
String URL = "GET /update?key="; // 以GET方式上傳資料到 ThingSpeak伺服器
URL += API_KEY;
URL += "&field1="; //field1上傳二氧化氮NO2數據
URL += NO2_value;
URL += "&field2="; //field2上傳乙醇C2H5CH數據
URL += C2H5CH_value;
URL += "&field3="; //field3上傳揮發性有機化合物VOC數據
URL += VOC_value;
URL += "&field4="; //field4上傳一氧化碳CO數據
URL += CO_value;
URL += " HTTP/1.1\n";

client.print( URL + "Host: " + HOST + "\r\n" +
"Connection: close\r\n\r\n" );

delay(10); // 等待一下下

// 接收ThingSpeak伺服器的回應
unsigned long timeout = millis();
while (client.available() == 0) {
if (millis() - timeout > 5000) {
Serial.println(">>> Client Timeout !");
client.stop();
return;
}
}
// Read all the lines of the reply from server and print them to Serial
// while(client.available()){
String line = client.readStringUntil('\r');
Serial.print(line);
// }
Serial.println();
Serial.println("closing connection");
}
}

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